The reformer Martin Luther (1483-1546) took a vow and joined the strict mendicant order of Augustinian hermits in 1505. Two years later he was ordained a priest and in 1512 he was appointed professor of biblical exegesis at the University of Wittenberg, a position he held until his death. At that time he wanted to eliminate the misguided developments of the Roman Catholic Church and restore it to its original Protestant form (re-form). Among other things, he denounced the then widespread trade in indulgences, the ransoming of sins. On 31 October 1517 he wrote his famous 95 Theses against the penitential practice of the Church (that he knocked them on the church door is probably only a legend). In the end, he thereby (not intended by him) triggered the reformation and division of the church.